Which method of physical security offers superior protection?

Question

Options

• ASmart card
• BBiometric scan
• CVideo surveillance
• DCombination of methods

• A
  5% (1)
• B
  10% (2)
• C
  5% (1)
• D
  80% (16)

Explanation

A combination of methods (D) is superior because no single control is foolproof - layering defenses forces an attacker to defeat multiple independent barriers simultaneously, which is exponentially harder than defeating any one alone (this is the defense-in-depth principle).

Why the distractors fall short:

• A (Smart card): Can be lost, stolen, or cloned - it proves possession, not identity.
• B (Biometric scan): More robust, but can be spoofed (fake fingerprints, photos) and a compromised biometric can't be "changed" like a password.
• C (Video surveillance): Purely detective - it records incidents but doesn't prevent unauthorized access.

Memory tip: Think of it as a bank vault: the combination lock (something you know) + key (something you have) + guard camera (detective control) is always stronger than any single one. Whenever an exam asks "which is best" for security, a layered/combined approach is almost always the correct answer.

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